Yong Heng Zhi Yin A1-OK Karaoke Version 220V 660W+660W Bluetooth Amplifier Power Amp for Home Use Features: – It can play video music and support subwoofer output – High-power home karaoke amplifier: 16 transistors, dual microphone input, guitar input – Supports U disk for lossless music playing – High-power toroidal transformer uses pure copper wire – 16 American transistors – Two large heat sinks – 60000UF Schottky rectifier plate – Imported reverberation chip – 7 audiophile-grade op amps – The effect of KTV can also be achieved at home. It is processed by Japanese reverberation chip, and the singing is easy and the voice is good. It supports treble and bass adjustment and reverberation adjustment for microphones. It is not easy to produce howling. And the accompanying sound is clear and friendly to ears. 7 imported audiophile-grade op amps are used for tuning and amplification of the audiophile preamp board. It is suitable for 10-15 inch speakers, and the recommended rated power of speakers should be 150-300W Specifications: – Model: A1-OK – THD: 0.01% (4? Load); 0.003% (8? Load) – Output power: 330W+330W (8 ohms);660W+660W (4 ohms) – Digital inputs: U disk, microphone, optical, coaxial and Bluetooth input – Mutual distortion: 0.01% – Input impedance: RCA input 20K? – Bluetooth version: Bluetooth 5.2 – Power requirements: AC220V 50/60Hz – SNR: 110dB – Audio input: RCA analog input – Frequency response range: 5Hz-88KHz – Output impedance: 4-8? – USB: Support U disk/hard disk – Net weight: 12.6kg/27.8lb – Product size: 430 x 355 x 110mm/16.9 x 14 x 4.3 (WxDxH) Package Included: – 1 x Set of Power Amplifier Packaging Details: – G. Usually it costs about 30USD-50USD. Thanks for your understanding. If you receive the item that not satisfied or defective, please do not open case and kindly notify us within 30 days.